diff --git a/src/core/desktop_screen_qt.cpp b/src/core/desktop_screen_qt.cpp
index 6469ad8c25eb54d9133def3c2ad0de4d0ec26983..720cd1faf8925c8a75dfe4c8f0b12da16b7bc655 100644
--- a/src/core/desktop_screen_qt.cpp
+++ b/src/core/desktop_screen_qt.cpp
@@ -70,7 +70,8 @@ std::vector<gfx::Display> DesktopScreenQt::GetAllDisplays() const
 
 gfx::Display DesktopScreenQt::GetDisplayNearestWindow(gfx::NativeView window) const
 {
-    Q_UNREACHABLE();
+    // RenderViewHostImpl::OnStartDragging uses this to determine
+    // the scale factor for the view.
     return gfx::Display();
 }